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Feeders
These are located below hoppers for
feeding of material at uniform rate to Belt Conveyors. Solcon
Feeders present the most efficient and economical method of
conveying bulk material. These are extensively used in steel
plants, quarries, collieries, mines and in other industries
pertaining to glass, ceramics, clay, sand chemicals and plastic
for conveying various types of materials.
We manufacture the following types
of feeders.
Belt Feeders :
Belt feeders maybe horizontal or inclined.
The features distinguishing Belt Feeders from ordinary Belt
Conveyors are the corking strand runs over a fixed runway
or bed of closely spaced rollers (with a pitch of 0.25 to
0.2m); there are no idlers on the lower strand; the feeder
has stationery skirt boards; belt speed is low (From 0.1 to
0.3 m/sec), as the material leaves the outlet slowly and forms
a comparatively heavy layer on the belt. Belt feeders are
used for granular and small lumped, less often for medium-lumped
materials. A flow-control valve regulates capacity. To eliminate
rapid belt-wear, the feed chute is shaped to diminish the
active pressure of the material on the belt.
Apron Feeders :
Apron feeders similar to Belt Feeders
may be horizontal or inclined; the angle of inclination of
an apron feeder is larger than that of a belt feeder. Apron
feeders may have travelling or stationary rollers, the latter
are spaced unevenly, at a smaller pitch in area under the
hopper outlet where the Apron is subjected to active load
pressure and at a larger pitch in the other sections.
Apron Feeders are predominantly used
for heavy and large lumped as well as for medium lumped materials.
Apron Feeders of specific design with a runaway of increased
strength are used to handle materials consisting of very large
lumps, for example for stone and ore charged to jaw crushers.
Ordinary Apron Feeders are used for
run-of-mine and sized coal, limestone, ore, etc.
The type of Apron employed on the nature
of the material and may be flat or corrugated with moving
or stationary skirt boards (heavy type).
Apron speed generally ranges from 0.05
to 0.25 m/sec. Low speeds are specified for low capacities
and also for heavy and large lumped materials as the outlet
of a hopper for such materials is large and the column of
the material bearing on the Apron is heavy.
Apron Feeders are strong. They permit
high load pressures on the Apron (important for large-sized
outlets) are reliable with difficult loads and unload the
material in a uniform stream. Their disadvantages are that
they are comparatively complicated in design and have large
weight resulting in high initial cost.
The Handling capacity and power requirements
for Belt and Apron Feeders are determined in a manner similar
to that for the conveyors of the same name. Specific features
given above must be taken into account.
Screw Feeders :
Screw Feeder consists of a continuous
Screw Rotating in a pipe. The shaft of the screws turns in
two terminals bearing mounted outside the pipe.
Screw Feeders are used for powdered,
granular and small lumped bulk materials, which do not have
a threat of further crushing. A flow control valve regulates
capacity. The pitch of the screw is generally smaller than
in-screw conveyors; the screw is sometimes double-threaded.
Reciprocating Feeders
:
An Reciprocating Feeder has a horizontal
or slightly declined table with stationary side-boards. Stationery
sideboards generally support the table. The table is generally
supported by stationary rollers or may be suspended on rods.
The table is set in reciprocating motion by an eccentric crank
gear.
The operating principle of a Reciprocating
Feeder differs somewhat from that of an Oscillating Conveyor.
When the table moves forward the material is carried along
by friction and a certain amount of material from the hopper
fill the free space formed below the outlet. When the table
moves backwards, the materials is prevented from following
the table by the rear wall of the discharge spout and therefore,
spill over the front edge of the table.
Reciprocating Feeders are used for
materials of medium and small lump-size, extra strong designs.
For large-lumped materials the handling capacity of the Feeder
is adjusted by a flow-control valve or by regulating the speed
of the table. Simple design and low initial cost have made
the Reciprocating Feeder a frequently used feeding device.
Vibrating Feeder
:
The Vibrating Feeder is an alternative
of the Vibratory Conveyor and its operating principle reminds
that of the conveyor. Low amplitude of Vibrations (generally
1 to 3 mm) and high vibrations (table stroke) frequency (up
to 3000 per minute) are typical of the vibratory feeder. The
trough is suspended on rods and supported by spring bars;
it is driven by an electric motor or an electromagnet. Vibratory
Feeders are preferably used for small lumped, less often for
medium lumped materials.
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